On Tue, Sep 24, 2002 at 01:46:39PM -0400, Aaron Woo wrote:
> I've written a dissect module for the Optimized Link State Routing
> Protocol (OLSR) IPv4, and am now trying to write the same for the IPv6
> version. I can't seem to figure out how ethereal differentiates between v4
> and v6.
What do you mean by "differentiates between v4 and v6"?
The way it differentiates betwen IPv4 packets and IPv6 packets is the
same way networking stacks do so - IPv4 and IPv6 have different Ethernet
packet type values, different PPP packet type values, and so on.
> I see that AODV6 has been written, so I've compared it to the AODV
> dissect code, but I am still unable to figure out how ethereal knows which
> version is being used.
It doesn't. The AODV6 dissector was written by somebody who, I guess,
didn't quite understand the way Ethereal handles protocols that are
selected by port numbers - it registers both the AODV and AODV6
dissectors with UDP port 654, but, unfortunately, only *one* dissector
can be registered with a given port number.
